Revert 290359 "Remove AudioBuffersState class."

trunk/src/media/audio/win/waveout_output_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/win/waveout_output_win.h"
 
 #include <windows.h>
 #include <mmsystem.h>
 #pragma comment(lib, "winmm.lib")
 
@@ skipping 307 matching lines @@
   if (callback_)
     callback_->OnError(this);
 }
 
 void PCMWaveOutAudioOutputStream::QueueNextPacket(WAVEHDR *buffer) {
   DCHECK_EQ(channels_, format_.Format.nChannels);
   // Call the source which will fill our buffer with pleasant sounds and
   // return to us how many bytes were used.
   // TODO(fbarchard): Handle used 0 by queueing more.
 
-  // TODO(sergeyu): Specify correct hardware delay for |total_delay_bytes|.
-  int total_delay_bytes = pending_bytes_;
+  // TODO(sergeyu): Specify correct hardware delay for AudioBuffersState.
   int frames_filled = callback_->OnMoreData(
-      audio_bus_.get(), total_delay_bytes);
+      audio_bus_.get(), AudioBuffersState(pending_bytes_, 0));
   uint32 used = frames_filled * audio_bus_->channels() *
       format_.Format.wBitsPerSample / 8;
 
   if (used <= buffer_size_) {
     // Note: If this ever changes to output raw float the data must be clipped
     // and sanitized since it may come from an untrusted source such as NaCl.
     audio_bus_->Scale(volume_);
     audio_bus_->ToInterleaved(
         frames_filled, format_.Format.wBitsPerSample / 8, buffer->lpData);
 
@@ skipping 46 matching lines @@
                                        buffer,
                                        sizeof(WAVEHDR));
       if (result != MMSYSERR_NOERROR)
         stream->HandleError(result);
       stream->pending_bytes_ += buffer->dwBufferLength;
     }
   }
 }
 
 }  // namespace media